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Associated func/constructor

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This commit is contained in:
Dan Buch 2017-12-31 11:04:17 -05:00
parent dbe2abdbe7
commit a8a1bdaaa8
Signed by: meatballhat
GPG Key ID: 9685130D8B763EA7
1 changed files with 6 additions and 1 deletions
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7
rustbook/rectangles/src/main.rs
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@ -12,17 +12,22 @@ impl Rectangle {
fn can_hold(&self, other: &Rectangle) -> bool { fn can_hold(&self, other: &Rectangle) -> bool {
self.width > other.width && self.height > other.height self.width > other.width && self.height > other.height
} }
fn square(size: u32) -> Rectangle {
Rectangle { width: size, height: size }
}
} }
fn main() { fn main() {
let rect1 = Rectangle { width: 30, height: 50 }; let rect1 = Rectangle { width: 30, height: 50 };
let rect2 = Rectangle { width: 10, height: 40 }; let rect2 = Rectangle { width: 10, height: 40 };
let rect3 = Rectangle { width: 60, height: 45 }; let rect3 = Rectangle { width: 60, height: 45 };
let rect4 = Rectangle::square(3);
println!("Can rect1 hold rect2? {}", rect1.can_hold(&rect2)); println!("Can rect1 hold rect2? {}", rect1.can_hold(&rect2));
println!("Can rect1 hold rect3? {}", rect1.can_hold(&rect3)); println!("Can rect1 hold rect3? {}", rect1.can_hold(&rect3));
for (i, rect) in [rect1, rect2, rect3].iter().enumerate() { for (i, rect) in [rect1, rect2, rect3, rect4].iter().enumerate() {
println!("rect{} has area {}", i+1, rect.area()); println!("rect{} has area {}", i+1, rect.area());
} }
} }